For all the people that will ask or wants to know what the system requirements are officially:

Recommended:

* 3 Ghz Intel Pentium 4 or equivalent processor
* 1 GB System RAM
* ATI X800 series, Nvidia GeForce 6800 series, or higher video card

Minimum System Requirements:

* Windows XP
* 512MB System RAM
* 2 Ghz Intel Pentium 4 or equivalent processor
* 128MB Direct3D compatible video card

Supported Video Card Chipsets:

* ATI X1800 series
* ATI X1300 series
* ATI X850 series
* ATI x800 series
* ATI x700 series
* ATI x600 series
* ATI Radeon 9800 series
* ATI Radeon 9700 series
* ATI Radeon 9600 series
* ATI Radeon 9500 series
* ATI Radeon 9000 series
* NVIDIA Geforce 7800 series
* NVIDIA Geforce FX series

But, you might ask "Can I play with these system specs?" so and so, so I'll recommend you some system specs that should allow you to play at high settings, medium and low that shouldn't cost TOO MUCH money. I'll give you some newegg links too.

NOTE: I will recommend an AMD dual-core processor for playing at high and medium settings because Oblivion benefits from multi-cores (Even a weak 3800+ X2 is pretty good in this game) and every part is assuming you want to play at a decent speed and all the parts I'm listing is not the max you can have. It's actually the average part needed to play at those settings. The motherboards are what I recommend (Also, I recommend the single card setup) and every part here has at least 4 stars average out of all the customer reviews.


High settings

AMD X2 4200+

http://www.newegg.com/Product/Product.asp?Item=N82E16819103547

Corsair ValueSelect 1GB

http://www.newegg.com/Product/Product.asp?Item=N82E16820145505

eVGA Geforce 7600GT

http://www.newegg.com/Product/Product.asp?Item=N82E16814130283

Medium-high settings:

AMD X2 3800+

http://www.newegg.com/Product/Product.asp?Item=N82E16819103562

Corsair ValueSelect 1GB

http://www.newegg.com/Product/Product.asp?Item=N82E16820145505

eVGA Geforce 6600GT/ eVGA 6800XT

http://www.newegg.com/Product/Product.asp?Item=N82E16814130214
http://www.newegg.com/Product/Product.asp?Item=N82E16814150130
Low-med settings

AMD Athlon 64 3200+

http://www.newegg.com/Product/Product.asp?Item=N82E16819103535

Corsair ValueSelect 512MB/ Corsair Value Select 1GB

http://www.newegg.com/Product/Product.asp?Item=N82E16820145505
http://www.newegg.com/Product/Product.asp?Item=N82E16820145026

eVGA Geforce 6600

http://www.newegg.com/Product/Product.asp?Item=N82E16814130260

Hard drive:

I recommend this one for every combination there.
http://www.newegg.com/Product/Product.asp?Item=N82E16822144160
Power supplies:

AMD X2 4200+, 7600GT, Corsair ValueSelect 1GB

http://www.newegg.com/Product/Product.asp?Item=N82E16817103928

AMD X2 3800+, 6800XT/6600GT, Corsair ValueSelect 1GB

http://www.newegg.com/Product/Product.asp?Item=N82E16817153023 (AMAZING PRICE)

AMD 3200+, 6600, Corsair ValueSelect 512MB

http://www.newegg.com/Product/Product.asp?Item=N82E16817153023 (AMAZING PRICE)

CD/DVD ROM
http://www.newegg.com/Product/Product.asp?Item=N82E16827101131

Motherboard:

SLi: http://www.newegg.com/Product/Product.asp?Item=N82E16813131568

CrossFire: http://www.newegg.com/Product/Product.asp?Item=N82E16813131584

Single card: http://www.newegg.com/Product/Product.asp?Item=N82E16813131569

I hope this has helped you "Elder Scrolls" fans.

P.S: If any of you want to know if you can play certain games with certain system specs, ask here. I'll try and help you. :hotbounce

I think your systems are a bit overdone. I run the game with a 3ghz p4 and all of my settings are on high or turned up, except AA (which is at 4x) and HDR/Bloom with my x800 does not support.

I'm just giving a direction for starters to go. Notice the med/high settings? That's the cheaper one that can run at high settings. I was bored and though maybe now that Oblivion is out, more people would ask for system requirements so I posted. I posted a power supply section for people who are going to build a whole new system too.